Power In Dc Wiring; Junction Box Connection - SAJ PDS33 Series User Manual

PDS33 Series

3.2.2 Power in DC Wiring

For Solar Pumping Systems, a two-pole DC disconnecting switch must be installed
between the solar array and the PDS33solar pump controller.
Connect the cables which comes from the two-pole DC disconnect Switch
downstream terminals marked with "+" and "-" (positive and negative poles of
Solar panel output), to PDS33 solar pump controller's terminals block labeled as
"+", "-" .
Note: The R, S, T terminals are with anti reverse connection protection; DC power
supply can be connected in the R, S, T terminals, can not consider the phase
sequence.
Before connect DC wiring, following the steps below to prevent hazardous electric shock
resulting in serious injury or device burning.
• Make sure that the external DC disconnect switch is off.
•To ensure that the polarity of the solar array cable must be properly connected to the
controller's +, - pole, otherwise possible damage the controller.
•Make sure that AC power is disconnected (If AC power supply is wired as backup power,
AC and DC power supply can not simultaneously put into the controller, otherwise it will
damage the controller.)

3.2.3 Junction box connection

If there are a large number of solar modules, it is necessary to use a junction box to
converge the bus to the solar array. The junction box need to install fuses, lightning
protection device and DC switch. The fuse and the DC switch can prevent the short
circuit protection; the lightning protection device can play the direct current side
the lightning protection function. The junction box must be sealed, and water can
not enter
WARNING
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